Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
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NPA: 321 [Rate centres in NPA 321] [Dial plan for NPA 321]

NXX: 538

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
321-538 A Melbourne FL   937C ONVOY, LLC - FL 45806   2026-05-03   
321-538 0 Melbourne FL   937C ONVOY, LLC - FL 45806   2026-05-03   
321-538 1 Melbourne FL   937C ONVOY, LLC - FL 45806   2026-05-03   
321-538 9 Melbourne FL   937C ONVOY, LLC - FL 45806   2026-06-22   

Last updated: Tue, 16 Jun 2026 00:09:45 UTC

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